<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title>代码块</title>
		<script>
			{
				alert("a");
				document.write("aaa");
			}
			{
				alert("b");
				console.log("bbb");
			}
		</script>
	</head>
	<body>
	</body>
</html>
